c#实现Rs232串口通讯

1、需要一根Rs232通讯线；2、2台PC机； 之前用c#实现的一个Rs232通讯，最近工厂新增产线，又翻出来看了看。 实现了两台pc机通过rs232通讯线来进行简单的发送、接收数据， 代码简单通俗易懂，适合入门。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }
        SerialPort port1 = new SerialPort（）;
        string InputData = String.Empty;
        delegate void SetTextCallback（string text）;

        private void Port_Select（）
        {//获取机器中的串口地址
            string[] ports = SerialPort.GetPortNames（）;
            foreach （string port in ports）
            {
                comboBox1.Items.Add（port）;
            }
        }

        private void Form1_Load_1（object sender EventArgs e）
        {
            Port_Select（）;
            this.comboBox1.SelectedIndex = 0;
            this.comboBox2.SelectedIndex = 0;
        }

        private void button1_Click（object sender EventArgs e）
        {
            if （button1.Text == “关闭串口“）  //当要关闭串口的时候
            {
                port1.DiscardOutBuffer（）;
                port1.DiscardInBuffer（）;
                port1.Close（）;
                button1.Text = “打开串口“;
                label3.Text = “串口当前状况：未打开“;
                comboBox1.Enabled = true;
                comboBox2.Enabled = true;
            }
            else if （button1.Text == “打开串口“） //当要打开串口的时候
            {
                try
                {
                    port1.PortName = comboBox1.SelectedItem.ToString（）;
                    port1.BaudRate = Convert.ToInt32（comboBox2.SelectedItem）;
                    port1.DataBits = 8;
                    port1.RtsEnable = true;
                    port1.Open（）;
                    port1.DiscardOutBuffer（）;
                    port1.DiscardInBuffer（）;
                    button1.Text = “关闭串口“;
                    comboBox1.Enabled = false;
                    comboBox2.Enabled = false;
                    label3.Text = “串口：“ + comboBox1.SelectedItem.ToString（） + “ 波特率：“ + comboBox2.SelectedItem.ToString（） + “  数据位：8 “;
                }
                catch
                {
                    button1.Text = “打开串口“;
                    label3.Text = “串口：“ + comboBox1.SelectedItem.ToString（） + “打开失败“;
                    MessageBox.Show（“该串口无法打开“）;
                }
            }
        }

        private void button2_Click（object sender EventArgs e）
        {//刷新串口列表
            comboBox1.Items.Clear（）;
            Port_Select（）;
            this.comboBox1.SelectedIndex = 0;
            this.comboBox2.SelectedIndex = 0;
            comboBox1.Enabled = true;
            comboBox2.Enabled = true;
            port1.Close（）;
            button1.Text = “打开串口“;
            label3.Text = “串口当前状况：未打开“;

        }

        private void button3_Click（object sender EventArgs e）
        {//发送数据
            byte[] data = En

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-12-06 09:47  串口通讯C#\
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\.vs\
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\.vs\串口通讯\
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\.vs\串口通讯\v14\
     文件       12800  2010-08-13 10:15  串口通讯C#\WindowsApplication1\.vs\串口通讯\v14\.suo
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\Backup\
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\Backup\Backup\
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\
     文件        8094  2010-08-13 10:00  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Form1.Designer.cs
     文件        3490  2010-08-13 10:15  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Form1.cs
     文件        5814  2010-08-13 10:01  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Form1.resx
     文件         478  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Program.cs
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Properties\
     文件        1186  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Properties\AssemblyInfo.cs
     文件        2894  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Properties\Resources.Designer.cs
     文件        5612  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Properties\Resources.resx
     文件        1104  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Properties\Settings.Designer.cs
     文件         249  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\Properties\Settings.settings
     文件        3245  2010-08-13 09:46  串口通讯C#\WindowsApplication1\Backup\Backup\WindowsApplication1\串口通讯.csproj
     文件         932  2010-08-13 09:46  串口通讯C#\WindowsApplication1\Backup\Backup\串口通讯.sln
     文件       12800  2010-08-13 10:15  串口通讯C#\WindowsApplication1\Backup\Backup\串口通讯.suo
     文件        4025  2018-01-15 14:14  串口通讯C#\WindowsApplication1\Backup\UpgradeLog.xml
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\
     文件        8094  2010-08-13 10:00  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\Form1.Designer.cs
     文件        3490  2010-08-13 10:15  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\Form1.cs
     文件        5814  2018-01-15 14:53  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\Form1.resx
     文件         478  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\Program.cs
     目录           0  2018-12-06 09:47  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\Properties\
     文件        1186  2010-08-13 09:43  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\Properties\AssemblyInfo.cs
     文件        2862  2018-01-15 14:14  串口通讯C#\WindowsApplication1\Backup\WindowsApplication1\Properties\Resources.Designer.cs
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